Duke's announcement came as the state is grappling with deep racial tensions after the shooting death of a black man by white police officers and the killing of three law enforcement officers by a black man. It also came one day after Donald Trump accepted the GOP nomination for president.

The white supremacist Duke is a former state representative who represented suburban New Orleans for one term more than two decades ago and was an unsuccessful candidate for Congress. His failed bid for governor in the 1991 race against former Gov. Edwin Edwards was one of Louisiana's most high-profile elections, with Duke opponents proudly showing bumper stickers supporting Edwards that read "Vote for the crook. It's important."

In a posting on his website, Duke said he'd been "urged by enormous numbers of people his district to run for United States Congress."

"With the country coming apart at the seams and no one willing to really speak the truth about what is happening, the majority population in this country needs someone who will actually give voice to their interests in the face of an increasingly violent hatefest launched by the media and political establishment against them," Duke's website says.